Pollutant Concentrations

Air quality readings will be available hourly from 7am to 11pm. Air quality readings from 12am to 6am will be made available at 7am on the same day.

Readings on 06 Jan 2015

View reading for:

Region

24-hr Sulphur dioxide(µg/m3)

24-hr PM10(µg/m3)

1-hr Nitrogen dioxide(µg/m3)a

8-hr Ozone(µg/m3)

8-hr Carbon monoxide(mg/m3)

24-hr PM2.5(µg/m3)

North

10(6)

21(21)

27(-)

6(2)

0.4(4)

11(47)

South

7(4)

20(20)

14(-)

14(6)

0.5(5)

11(45)

East

9(5)

21(21)

23(-)

10(4)

0.5(5)

13(52)

West

3(2)

18(18)

25(-)

23(10)

0.5(5)

9(37)

Central

6(4)

18(18)

32(-)

20(9)

0.6(6)

9(36)

1-hr PM2.5 (µg/m3)b Readings on 06 Jan 2015

View reading for:

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

North

20

24

16

9

10

11

10

10

14

15

15

12

South

7

7

9

4

8

5

7

7

10

17

19

23

East

19

29

20

11

14

13

13

15

6

19

16

12

West

8

11

8

7

6

7

9

7

8

13

19

12

Central

16

7

7

6

8

4

8

8

8

5

9

13

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

North

10

9

9

10

6

3

5

7

10

8

6

-

South

25

24

15

27

12

6

5

4

3

5

3

-

East

14

16

12

19

14

4

7

6

8

11

5

-

West

15

14

11

18

12

6

3

3

4

5

6

-

Central

11

15

12

21

13

5

5

3

4

5

7

-

Note:a Sub-index for nitrogen dioxide is reported only when the 1-hr concentration equals or exceeds 1130 µg/m3.

b There is no sub-index for 1-hr PM2.5.

3-hr PSI Readings from 1am to 12am on
06 Jan 2015

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

3-hr PSI

51

53

53

48

39

34

37

37

39

45

52

54

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

3-hr PSI

54

54

53

55

53

49

30

20

21

24

26

-

Hourly updates of 3-hr PSI readings are provided from 7am to 11pm. The 3-hr PSI readings from 12am to 6am will be made available at 7am on the same day. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.